const express = require("express");
const router = express.Router();

const { Article, User } = require("../../models");
const { Op } = require("sequelize");
const { NotFoundError } = require('../../utils/errors');
const { success, failure } = require('../../utils/responses');

//查询所有文章
router.get("/", async function (req, res) {
  try {
    const query = req.query;

    //当前第几页
    const currentPage = Math.abs(Number(query.currentPage)) || 1;

    //每页多少条数据
    const pageSize = Math.abs(Number(query.pageSize)) || 10;

    const offset = (currentPage - 1) * pageSize;

    const condition = {
      order: [["id", "DESC"]],
      limit: pageSize,
      offset: offset,
      include: [
        {
          model: User,
          as: 'user',
          attributes: ['id', 'username', 'nickname', 'avatar', 'company'],
        }
      ]
    };
    if (query.title) {
      condition.where = {
        title: {
          [Op.like]: `%${query.title}%`,
        },
      };
    }

    const { count, rows } = await Article.findAndCountAll(condition);
    success(res, "查询文章列表成功", {
      articles: rows,
      pagination: {
        total: count,
        currentPage,
        pageSize,
      },
    });
  } catch (error) {
    failure(res, error);
  }
});

//查询文章详情
router.get("/:id", async function (req, res) {
  try {
    const article = await getArticle(req);

    success(res, "查询文章成功", { article });
  } catch (error) {
    failure(res, error);
  }
});

//创建文章
router.post("/", async function (req, res) {
  try {
    //白名单过滤
    const body = filterBody(req);
    const article = await Article.create(body);

    success(res, "创建文章成功", { article }, 201);
  } catch (error) {
    failure(res, error);
  }
});

//删除文章
router.delete("/:id", async function (req, res) {
  try {
    const article = await getArticle(req);
    await article.destroy();
    success(res, "删除文章成功");
  } catch (error) {
    failure(res, error);
  }
});

//更新文章
router.put("/:id", async function (req, res) {
  try {
    const article = await getArticle(req);

    //白名单过滤
    const body = filterBody(req);

    await article.update(body);

    success(res, "更新文章成功", { article });
  } catch (error) {
    failure(res, error);
  }
});

/**
 * 公共方法：查询当前文章
 */
async function getArticle(req) {
  const { id } = req.params;

  const article = await Article.findByPk(id);

  if (!article) {
    throw new NotFoundError(`ID:${id}的文章未找到`);
  }
  return article;
}

function filterBody(req) {
  return {
    title: req.body.title,
    content: req.body.content,
    userId: req.body.userId,
  };
}

module.exports = router;
